if you can just cover the visible connector (with some kind of vinly backing)

I plan on doing that with the next ones I build. I didn't this time b/c I was in a hurry to get it done as I needed it for a trip. I was taking another vehicle and my empeg with me so I needed to have something for those left behind so they could have some tunes.

it might be nice as an option to have a male headphone jack adapter dangling inside the pocket, for those times when you want to connect your choice portable player

I could do this as well. That seems to be pretty easy as all you would do is splice the wire and attatch it to the auxilary connectors. If you are intersted I'll work one up for you next month.